Table 4.

Length of Stay Regression Results.

Parameter	Estimate	Rate Ratio	p-value
Intercept	2.275	9.72	<0.0001
Monitoring (Hct vs tHb)	0.078	1.08	<0.0001
Midwest vs South Geographic Area	−0.001	1.00	0.9601
Northeast vs South Geographic Area	−0.146	0.86	<0.0001
West vs South Geographic Area	−0.054	0.95	<0.0001
RBC Transfusion	0.221	1.25	<0.0001
Major Teaching vs Non–teaching	0.098	1.10	<0.0001
Minor Teaching vs Non–teaching	0.015	1.02	0.0818
Age (in years)	−0.004	1.00	<0.0001
Pump (off vs on–pump)	0.047	1.05	<0.0001
CABG only vs dual CABG & Valve	−0.084	0.92	<0.0001
Valve only vs dual CABG & Valve	−0.025	0.98	0.0773
Intravenous Iron Administration	0.249	1.28	<0.0001
Hemorrhage	0.467	1.60	<0.0001
Dehydration	0.101	1.11	<0.0001
Polycythemia vera	0.048	1.05	0.5748
Burns	0.363	1.44	0.0755
Vomiting	0.037	1.04	0.1483
Hypertension	−0.085	0.92	<0.0001
Trauma	−0.127	0.88	<0.0001
Renal Failure	0.428	1.53	<0.0001
Myocardial Infarction	0.102	1.11	<0.0001
Congestive Heart Failure	0.176	1.19	<0.0001
Peripheral Vascular Disease	−0.017	0.98	0.0947
Cerebrovascular Disease	0.048	1.05	<0.0001
Dementia	0.152	1.16	0.0304
Chronic Pulmonary Disease	0.065	1.07	<0.0001
Rheumatic Disease	0.036	1.04	0.1031
Peptic Ulcer	0.020	1.02	0.5092
Mild Liver Disease	−0.012	0.99	0.766
Diabetes without Chronic Complication	0.018	1.02	0.0298
Diabetes, with Chronic Complication	0.051	1.05	0.0004
Hemiplegia or Paraplegia	0.340	1.40	<0.0001
Renal Disease	−0.013	0.99	0.2441
Malignancy	−0.005	1.00	0.8001
Moderate or Severe Liver Disease	0.372	1.45	<0.0001
Metastatic Solid Tumor	0.074	1.08	0.1731
AIDS/HIV	0.116	1.12	0.1798
RBC Transfusion * monitoring interaction	−0.055	0.95	0.0042
RBC Transfusion * hemorrhage interaction	−0.142	0.87	<0.0001

CABG: coronary artery bypass graft; AIDS: acquired immune deficiency syndrome; HIV: human immunodeficiency virus; RBC: red blood cells.